Emulator build with poetry shell fails on Mac OS X with Clang 15 and buildgen v0.61

[tomesink]

Describe the bug
When trying to follow the documentation after fresh install, the make build_unix within poetry shell environment, fails with an error.

Firmware version and revision
Current (latest commit is f8be07b) main branch.

Desktop/smartphone setup (please complete the following information):

• OS: macOS Sonoma 14.4.1 (23E224)
• clang --version:

Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: arm64-apple-darwin23.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

To Reproduce
Steps to reproduce the behavior:

1. git clone --recurse-submodules https://github.com/trezor/trezor-firmware.git
2. cd trezor-firmware
3. poetry install
4. brew install scons sdl2 sdl2_image pkg-config llvm
5. rustup default nightly && rustup update
6. cd core
7. poetry shell
8. make build_unix

Expected behavior
Build is successful.

Screenshots

--- stderr
  thread 'main' panicked at /Users/martin/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.29/src/fallback.rs:702:9:
  "_mp_obj_fun_builtin_fixed_t_union_(unnamed_at___/__/vendor/micropython/py/obj_h_981_5)" is not a valid Ident
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
scons: *** [build/unix/build/unix/rust/aarch64-apple-darwin/release/libtrezor_lib.a] Error 101
make: *** [build_unix] Error 2

Additional context
The problem is described here, however it suggests problem is in Clang version 16 and above. But I am encountering this error with clang 15.

However, there is a workaround in updating the bindgen crate to version 0.62.0 and above (current version os 0.69.4):

1. Updating the bindgen to version 0.62.0 in core/embed/rust/Cargo.toml
2. As 0.62.0 and above changes the API of bindgen::EnumVariation it is needed to add is_global variable when creating default enum style in core/embed/rust/build.rs line 37:

        .default_enum_style(bindgen::EnumVariation::NewType { is_bitfield: false, is_global: false })

With the workaround applied, build is done and I am able to run the emu.py. Also all tests passed locally.

After investigating this problem I suggest to update the version of bindgen to at least v0.62.0 and do the necessary changes in the code.

If someone gives me a green light, I can prepare the PR for this.

[tomesink]

Solved by #3773

[tomesink]

Reopening because the #3773 solves the problem under nix-shell. Without using the nix-shell with poetry only, the build errors as described above.

[prusnak]

I confirmed the issue on macOS - I applied the suggested changes in #3782